As of July 31st, 2017, the MantaMate is shipping. New orders will be shipped within one week of purchase.
More information: The MantaMate.
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The MantaMate manual is now available: MantaMate Manual

The MantaMate is a Eurorack analog synthesizer module that allows the Manta and other controllers to communicate with an analog synthesizer. It turns the Manta into a powerful sequencer and keyboard for your synth.

It also acts as a general-purpose USB-MIDI to CV converter, acting as an embedded host for USB-MIDI devices and acting as a device for a host computer, so you can control the CV outputs from your DAW.

Additionally, the MantaMate makes it possible to connect inexpensive HID game controllers such as flight-simulator joysticks to your modular synthesizer.

The Snyderphonics JD-1 Custom Keyboard/Sequencer was
shipped to the person who commissioned it. You can read the manual for the
prototype model (with some features not yet implemented)
here. I currently have no plans to make this available as a commercial product, but it was an interesting custom job! Much of the sequencer/keyboard design inspired functionality in the MantaMate, so it was also useful in that way.